I guess that's the next step after Fission, since it takes a Fission reactor to make a Fusion reactor. We're just about finished with getting it up and running, we'll use that for a bit to run several quarries and get more materials before we go Fusion. Is that the best type of power? I'd like to get something that's 'near' self sustaining but outputs a lot of energy. Haven't looked into Biofuel yet. Never even crossed my mind, actually.